Core-drill construction



Sept. 16, 1930. L. s. COPELIN CORE DRILL CONSTRUCTION Filed April 9, 1928 w 84 Y Z M /c m r M0 6 N "W m 3 w a n l J a a.

Patented Sept. 16, less LEONARD S. COPELIN, OF LOS ANGELES, CALIFORNIA cons-13mm cousrnucrrolv application filed April 9, 1928. Serial No. 268,763.

My invention relates to the art of taking cores, being more particularly a core drill of the double barrel type in which means are provided for locking the parts together 5 against accidental disengagement. Ordinarily core drills of the type referred to are made of a number of parts threaded together, and it frequently happens that, due to the rotary movement of the drill during the drilling operations, the parts become unthreaded and are lost in the hole, thereby causing a fish ing operation which is highly undesirable. both from the viewpoint of expense involved and time lost in recovering parts of the drill.

The principal object of my invention is to provide simple and eiiicient means for locking the parts of the drill together so that accidental unthreading of the parts is prevented Other objectsand advantages will appear hereinafter from the following description.

Referring to the drawings, which are for illustrative purposes only,

Fig. 1 is a vertical sectional view, partly in section, showing a core drill embodying a form of my invention.

Fig. 2 is a side elevation of the lower end of the drill shown in Fig. 1.

Fig. 3 is an inverted plan view of the drill as shown in Fig. 2. a

Fig. 4 is a sectional plan view on line 44 of Fig. 1, and Fig. 5 is a sectional plan view on line 5-5 of Fig. 1. v

More specifically describing the form of my invention shown in the drawings, 11 indicates a sub adaptable for attachment to the lower end of a drill string (not shown). Threaded into the lower end of the sub is the outer barrel 12 of the core drill, such outer barrel being of proper length to take the length of core desired.

The lower end of the barrel 12 is threaded into the upper end of a tool joint 13, such tool joint having a reduced lower end 14, threaded to receive the upper end of a drill body 15. The drill body is provided at its lower end with transverse slots 16 to receive keys 17 formed on the cutter head 18, such cutter head being bowl-shaped and terminating at .5? its lower end in a circular cutter 20 consisting of a series of teeth arranged about a core receiving opening 21.

designates a circular shoulder formed in the head 18 upon which is seated the lower end of a sleeve 23, such sleeve being threaded into the head 18, as clearly shown in Fig. 1. The sleeve 23 extends through a central bore 24 in the body, and is threaded at its upper end to receive a locking nut 25, such locking nut being secured to the lower end of the core receiving tube or barrel 26 by means of welding, as indicated at 27. or in any other suitable manner.

30 designates a core catcher which, in the form shown, consists of a thin pipe section seated at its lower end on a shoulder 31, formed in the sleeve 23, a series of inwardly and upwardly extending spring lingers 32 being secured to the inner walls of the pipe section by means of rivets 33 or other suitable fastening means.

35 designates a lug formed on the sleeve 23 and extending outwardly therefrom into a recess 36 formed in the body 15 at the base of one of the slots 16, the walls of such recess preventing turning movement of the sleeve in the body 15 by engagement with the lug 35.

4O designates a circular chamber formed in the body 15 which receives circulating fluid from the passage 41 formed between the inner and outer barrels, such chamber being connected therewith through a circular passage 42 formed between the inner barrel and the inner walls of the tool joint- 13.

From the chamber circulating fluid is discharged through ducts or passages 44 into an annular space 45 formed in the body 15. Extending downwardly from the chamber 40 in the body 15 is a series of sockets or recesses 50, there being two such socket-s arranged diametrically opposite to each other in the body.

Formed on the locking nut 25 are a series of lugs 51, in the present instance there bethe lugs51, a handle 53 being provided for the insertion of said locking ban such handle I extending upwardly therefrom and into the passage 42 inthe too-l joint, as clearly shown I in Fig. 1. i

v The body in the present' form is provided with four fluid outlets 44:, as clearly illus trated in Fig.4, and three lugs are used on the locking nut sothat the lOClilIlgbtLI' may be inserted in either of the sockets 50 and engaged by one of the'lugs Withoutcovering any of the fluid passages 44. a I I Itis understood thatany preferred iorln of cutting members may be used onrthe head 18," in the form shown two sets of blades 55 and 56 being formed on the head,

the'cutting. edges .57 of the bladesf55 being at or'nearthe cutting level .ofthelcircular cutter 20, andthe cutting edges 58 of'the I blades 56 being above the cuttin-g'edges of in theslots 16, the lug 55 entering the re-- tached thereto is thenthreaded onto the end of the sleeve '23 until the lowerlend of the 'locking'nut rests upon a shoulder (SO-formed the blades The cutting diameters of the two sets of blades are different in that the blades'56 extend laterally; from the head a greater distance than the blades 55 The core drill is assembled in the 15 W: ing manner: The sleeve 23 is threaded into the head 18, afterwhich the sleeve is inserted in the drill body, with the keys 17 cess 36, in which assembled position the sleeve isprevented from turning inthe drill body and the head also prevented .from turning with respect to the drill body. The locking nutwith the corereceiving barrel '26 atinthe drill body, as shown in Fig 1.

' 4 When in this position,'-the'locking bar members 15.

placed in one of the sockets 50, as shown in Fig. 1, and due to the arrangements of lugs 51 on the locking nut, such nut cannot turn,

over one-third of a rotation, and, consequent 1y, cannot become disengagedfrom thebody After the parts are assembled as above described, the'tool jointand outerbarrel are attached to the body asfabove described. I claim as my invention: I

1. A'rotary core drill construction Com:

prising a drill body, a cutter head onsaid body, a sleeve in said body threaded to said head, interenga'ging means on saidv bodyand said sleeve for preventing relative rotative movement therebetween, an outer barrel on said head, and an inner barrel connected to said sleeve. i r

2.; A rotary. core drill construction comprising a drill'body, avcutter head on said body, interengaging means on said headvand said body to prevent relative'rotative move- 7 ment therebetween, a sleeve in said body threaded to said head, inte'rengaging. means onsaid body and said sleeve forgpreventing relative rotative movement therebe'twefen,

saidl i-nterengaging means, on said body and sleeve consistingofa lug on said sleeveextending into a. recess in said body, an outer barrel on said head, and an inner barrel connected to sald sleeve,

A 'rotaryfcore drillconstruction comprising. a drill body, a. cutter head on said body, a sleeve in said body threaded tosaid head,interengaging meanson said body and said sleeve for preventing relative rotative movement .therebetween, an outer barrel on said head, an inner barrel connected to said sleeve, .and.,1neansfor limiting the IfBlfl/DIVB.

rotativemovement" between said inner barrel and said head. f

4. A otary body, a sleeve insaid body 'threaded tosaid head, interengaging means :on said body and,

saidsleeve for preventingcrelative rotative movement therebetween, an outer barrel on saidhead, and an inner barrel connected to interengaging means between. said inner bar rel andsald head. a

-5.-' A rotarycore drill construction c01 5: drill construction comprising adrill. body,:-.a cutter-head. on, said said sleeve, said limiting means consisting of f i prisinga drill-body,- a;,cutte1"headon.said

said body to prevent relativerrotativemovement therebetween, a sleeve in said body threaded to said head, interengaging-means I lbody, interengaging means on saidhead and on'said'body and said sleeve for preventing relative rotative movementtherebetween, an

:outerbarrel on said head, andan inner barrel I connected to said sleeve, saidlimltlng means consistingof a lug extending'outwardly from said inner barreland a removable locking bar. seated in said drill body extendingi 'into engageable position with saidlugfl 6. A rotary core drill construction com-" prising drill body; a cutter head-and'an outer'barrel on said b0dy;ianinner barrel mountedin said body; and interengaging means for preventing relative rotativemove-o ment; between said inner barrel and said body, said -1nterengag1ng means comprising a lug iio 

